Number of trailer axles is a moot point for this discussion.
You have max limits on many things - towing weight, axle loading, tire loading, vehicle weight, GCWR (gross combined combination rating).
I"m looking at GCWR - which is the total weight of all that is moving down the road -the tv, tt, cargo, people, hitch, etc. It's what the engine/trans has to actually move and what the brakes (including the trailer brakes) has to stop. Frontal area, regarding wind resistance, is also a factor as speed increases but is rarely mentioned, as are a few other considerations.
So the truck ways 5400 lbs 'dry', or 'curb weight' as they often call it. Meaning no cargo. It also has a max wt rating of say, 7200lbs. That 7200 includes everything being supported by it's own axles - the truck, people, cargo and tounge weight of the trailer. The people in my family add up to about 700 lbs, the trailer tounge weight is going to be 700-800 lbs and a full tank of gas is 250lbs. The hitch deal weighs another 60 lbs. There will no doubt be video games, phones, clothing, food and such added to the load too. 1800lbs of payload? Sure. Add to the 5400 and i'm at 7200 max load...we best not stop for a big lunch.
A lot of that weight is on the rear axle, perhaps too much, overloading it. A WD hitch does just that - it distributes the weight to the front axle of the truck - but as far as I know you still have that tounge weight added to the tow vehicle's payload total.
So the truck weighs 7200lbs, loaded., w/ trailer attached.
The trailer is listed at 5400 lbs w/ options (my TT has a sticker on the storm door that lists it although I've not checked it for accuracy). From what those here say your 12v batteries, propane and of course water are not in that figure, so add 120 lbs plus water (we'll assume it's dry for now). Now add in your cargo - television, bedding, towels, pots and pans, leveling wood, kids bikes, dog stuff, clothing, chairs, firewood, tennis rackets, etc, etc. 1500 lbs? Sure, no problem I'd bet. So add 1620 to the 5400 and you're just over 7,000 lbs. ready to roll.
Add the truck to the trailer and you have 14,200 lbs GCWR. My owners manual warns that exceeding the GCWR will damage the transmission.
I felt we'd have a margin of error with the expedition and our trailer. The more I investigate the issue - and have the owners manual to read the details in - I'm not nearly as confident as I once was. Our options are limited - and not cheap - to rectify this issue.
The wife is dead set against a pickup even with a cap. When we first started looking for a TV it was to replace one of our daily drivers, it's now a third vehicle so in some ways we have more options. Unfortunately around here what will work is rare - and therefore expensive when you do find it. We should have a 2wd expy EL w/ 3:73 gears and HD towing package - in a good condition at a price we can afford. An excursion is perhaps a better option but even more rare and costly. We'll get it all set up, weigh it, tow at least once and then decide where we stand. All we have to do is move it to a spot from the storage area and back. We' like to bring it home at the end of the season (75 miles or so). If we can pull it 500 miles once a year for a family vaca somewhere then we'll be in hog heaven. The expy will do the spotting no problem. We can hire out the 75 mile move if needed or borrow/ beg a truck off a friend or neighbor. I just can't afford or justify a $25,000 diesel tow rig for a single 500 mile trip a year. At least not right now.
I also full expect to trash the trans in my truck - it's original with 232,000 miles on it...perhaps a HD rebuild and some other mods (smaller overall diameter tires/wheels) will bring things up to par. I"m not apposed to changing axle ratios but it's expensive or dirty work, assuming they make 3:73 front gears.
Originally Posted by BigRed
Pro fate............you have completely lost me on the way you figure what a TV can Tow. Arent you forgetting the camper has 1 or 2 axles, which will pick up most of the wieght of the camper. So then the hitch or pin wieght would be what is added to the wieght rating of the axles on the truck. Then throw in numbers to off set engine power/torq ratings,braking power and rear end gears to come up with the tow ratings. You lost me.